Studies on Silvering of Fish Skin-I

FUJII Yutaka, YAMADA Juami, ONISHI Toshio

doi:10.2331/suisan.37.55

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Other Title

魚皮の銀色化に関する研究-I
魚皮の銀色化に関する研究I : 養殖サケ・マス類における皮のプリン塩基の消長
サカナヒノギンイロカニカンスルケンキュウ 1 ヨウショクサケマスルイニオケルカワノプリンエンキノショウチョウ
Purines in the Skin of Cultured Salmon and Trout
養殖サケ・マス類における皮のプリン塩基の消長

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Abstract

Guanine and hypoxanthine contained in the skin of Hime (Kokanee) salmon, Oncorhynchus nerka f. adonis, cherry salmon, Oncorhynchus masou f. mason, rainbow trout, Salmo gairdnerii irideus and brook trout, Salvelinus fontinalis were analyzed.<br> The purines were found several times richer in the ventral skin of the fish than in the dorsal skin (Fig. 2 and Table 3). In the stages showing silvery color, the purines appeared deposited mostly on the scale and in a white layer between the dermis and muscle, which is tentatively called “skin layer” by JOHNSTON and EALES⁵⁾ (Fig. 3 and Table 4). The purines in the skin of non-silver fish showed a tendency to decrease as the fish grew, from 8 to 32 months old. On the contrary, those in silver fish were several times, sometimes ten times higher in content than those in the non-silver fish 8 to 32 months old (Tables 5, 6 and 7).<br> Considering the fact that fish gains much in weight during this period, it may be concluded that the purines in silver fish are continually synthesized and deposited at this stage. However, in non-silver fish such synthesis do not seem to take place, and therefore, the deposition of purines could not be observed.

Journal

NIPPON SUISAN GAKKAISHI

NIPPON SUISAN GAKKAISHI 37 (1), 55-62, 1971

The Japanese Society of Fisheries Science

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